How Do I Find the Line of Mcgee S and Blanton S I Come from

I know I come from more than these 4 names. But I'm grand daughter of Jame F. McGee and Doris M.Martin they have 8 children my mom is one. And grand daughter of Henry E. Blanton and Mary J.Lockyer they had 5 children. I know the most about my mom's side of the family, ironically its the surname I have that I know the least about, mostly I believe because my grand father Henry E. Blanton was in the air force and they moved around a lot but I believe his family orginated in SC, he's buried in New York I believe.